Contactor switch device



March 22, 1960 I R. L. FILLIETTE CONTACTOR SWITCH DEVICE Filed June 18, 1958 I5 Sheets-Sheet l March 22, 1960 R. L. FILLIETTE CONTACTOR SWITCH DEVICE Filed June 18, 1958 3 Sheets-Sheet 2 March 22, 1960 R. L. FILLIETTE 2,929,899

CONTACTOR SWITCH DEVICE Filed June 18, 1958 3 Sheets-Sheet 3 449 6'3 64 Fig. 7 5

- Emma mum United States Patent CONTACTOR SWITCH DEVICE Raymond L. Filliette, Rueil-Malmaison, France, assignor to La Telemecanique Electrique (Societe Anonyme), Nanterre, rance, a French company Application June 18, 1958, Serial No. 742,827 Claims priority, application France July 3, 1957 Claims. (Cl. 200-194) This invention relates to high-power electromagnetic relay or contactor switch devices. The invention more particularly relates to such devices of the type including a magnetic core structure and an armature movable relatively thereto, both the core and the armature being of the three-legged or E type, with an energizing winding on the middle leg of the core, energization of which winding will cause displacement of the armature towards the core, and a plurality of switch contacts arranged to be operated on such displacement of the armature, wherein some at least of said switch contacts have a relatively high cut-off capacity.

In devices of this general type the side of the movable armature directed towards the core carries the movable contacts, usually in the form of bridge contact members and disposed normally to the plane of the legs of the armature and core. The bridge contacts cooperate with stationary contacts carried on a frame structure arranged on both sides of the core.

This prior arrangement has a number of drawbacks, since therein the magnetic circuit of the relay and the energizing or control winding of it are, in effect, surrounded on all sides by the supporting means for the stationary and movable contacts, thereby interfering with free access 'to the magnetic circuit and with satisfactory cooling dissipation of heat.

it is an object of this invention to provide a device of the general character specified wherein heat dissipation is improved, wherein both the movable armature and the control winding are freely accessible, and wherein moreover a large variety of different contact arrangements is made available.

In accordance with the invention, the movable armature of the relay is resiliently supported, in the general plane of symmetry of the armature normal to the major dimension of the legs of it, from a pair of spaced guide posts positioned on opposite sides of the armature; there is provided supporting structure on which said posts are guided for translational displacement on displacement of said movable armature towards and away from the core of the device, which structure also supports the stationary contacts and some at least of the movable contacts being carried on said guide posts. With such an arrangement, the movable contacts, instead of being positioned above the armature, are positioned to either side of it and generally parallel to the larger dimension of the armature.

A feature of the invention will thus be seen to lie in the fact that the movable armature does not require any special guide means associated with it liable to interfere with its displacements and open to rapid wear, and that the armature is simply suspended in a flexible or resilient manner from the contact-supporting posts.

The guide means for the posts may include, at least on the side where said movable armature is connected with said posts, ball bearing means interposed between the posts and the adjacent guiding surfaces of the stationary supporting structure.

Preferably the saidstationary supporting structure com- 2,929,899 Patented Mar. 22, 1960 prises a set of casings of insulating material internally formed with cavities coresponding in number with the contacts, said casings being firmly sealed to withstand the high internal pressure developed in them on operation of the contacts by cut-off arcing effects.

The number of contacts actuated by the relay switch may be increased by providing longitudinal extensions on the movable armature adapted to cooperate with a further pair of stationary contact-supporting casings disposed at right angles to the first pair.

The three-legged core with which the movable armature cooperates may be rigidly secured to a backing plate which further carries the stationary contact supporting casings on opposite sides of the core.

Such last-mentioned construction however may have a drawback in that impacts of the movable armature against the core are transmitted through the rear or backing plate and the contact supporting casings to the stationary contacts, so that the stationary contacts are apt to vibrate somewhat for a short period of time on engagement therewith of the movable contacts. Moreover the movable armature may tend to rebound slightly away from the core. These drawbacks may be overcome, according to another feature of the invention, by mounting the core upon a plate through resilient means so as to allow some freedom of movement to the core in all directions.

Preferably, in order to facilitate dismantling the components of the system without requiring access to be had to the side of the base plate opposite the side carrying the switch, said casings may be fitted in said plate and secured thereto by at least one screw inserted into the plate from the front of it, while the core is carried by said casings by way of resilient shock-absorbing spacers interposed between the mutually facing sides of the supports and the core. For this purpose, fingers project from the casings and the core into adjacent relationship and the resilient spacers are engegeable over said fingers.

In one desirable construction of the invention the resilient connection between the movable armature and the movable contact carrying guide posts is provided by means of a fiat element connected to the outer face of the movable armature transversely thereto, and formed with arms adapted to fit, with some clearance, over the extremities of the guide posts, and means for resiliently connecting said eiement with the guide posts, in the form of an arcuate spring plate having ends engaged in notches formed in said posts and positioned to press said fiat element against shoulder surfaces of the posts. The spring plate is adapted to be disengaged as by imparting a sliding or a rotational displacement to it, so as to release the movable arrnature from the guide posts for dismantling the device.

Further, in the embodiment just described, the winding may be simply placed upon the middle leg of the core and retained thereon by springs interposed between the outer face of the winding and the oppositely adjacent face of the fiat element. in such case said springs would likewise supply the restoring force for returning the movable assembly comprising the armature and guide posts to its idle position.

It will be noted that in this construction the magnetic attraction force applied to the movable armatureand the opposing spring restoring force applied thereto are substantially parallel to the longitudinal direction of the posts, so that it will be unnecessary to provide any additional sliding means for the movable armature, and said armature may be allowed to move freely with respect to the control winding thereby eliminating all sources of wear. The burden of guiding the movable assembly will then be entirely assumed by the guide posts slidable in their guiding recesses, and, preferably, including guide collars fitted over the upper end portions of the posts,

' is attracted towards the core.

placement by the longitudinal displacement of the posts 7 which is e'ilected with a minimum of friction owing which collars may be made'from a suitable wear-resistant material such as a superpolyarnid or other suitable plastic.

Exemplary embodiments of the invention will now be described for purposes of illustration but not of Y limitation with reference to the accompanying drawings, wherein:

Fig. l is a plan view of a switch device according to the invention;

Figs. 2 and 3 are sections on line iilI and Ill-11! respectively of Fig. 1;

Figs. 4a, 4b and 4c illustrate different modified censtructions of contact casings in section on line lV-IV of Fig. l;

Fig. 4a is a section on line IVd-lVd of Fig. 4b;

Fig. 4e is a section on line lVe-lVe of 4b;

Fig. 5 is an end view on line V-V of Fig. 1;

Fig. 6 is a plan view of a modified switch device according to the invention with the movable armature and V armature and winding in position;

Fig. 8 is a view on line VIHVHI of Fig. 6; and

Fig. 9 is a perspective exploded view of the apparatus.

As shown in Figs'l to 5, a relay or contactor switch device according to the invention is generally mounted on a base plate i. Supported in upstanding condition above the plate and generally centrally of it is a magnetic core 2 which may comprise the usual stack of laminations assembled between spaced side plates it: having their lower ends bent outwards at right angles to provide flanges secured to the base plate through any suitable means not shown. The core 2 is of the conventional three-legged type. Also secured to the plate parallel to and to either side of the core are elongated casings 3 containing the stationary contacts therein as will be later described.

Mounted on the mid-leg of the core 2 is a control or energizing winding 4. Magnetically cooperating with the core is a movable armature structure 5 likewise of threelegged shape and having its upper face secured, by way of end flanges provided by the out turned ends of the side plates'5a of the armature to a plate 6 in the general form of a cross having its arms on secured to the posts 7, presently described, by screw caps S engaging screw studs 9 fixedlysecured in and projecting from said posts, with thick washers 10 of rubber or similar yielding material being interposed between the upper surface of plate 6 and the nuts or caps 55.

The posts 7 are in the form of prismatic bars of preferably square cross-section. made from insulating material, and arranged for axial sliding movement within the casings 3. Balls 11 are received partly in short grooves 7a formed in the sides of the posts and partly in grooves 3a formed in the sides of the channel defined in the cas .ing 3 through which channel the posts extend, thereby providing antifriction sliding bearing surfaces for the posts. On their opposite sides the posts are in smooth frictional engagement with the side of said channel, and the length of the posts is so predetermined that their lower ends lie flush with the under side of the mounting plate 3 in the idle position of the relay switch device. it will be understood that the baseplate l is suitably apertured to allow the posts to extend freely through it.

Arranged within an inner recess formed near the base of each casing 3 is a spring 12 which in the construction shown is a torsion spring having one branch anchored to the casing 3 and its other branch 12a projecting into a cutout or notch 715 formed laterally in the post 7.

With the winding 4 energized, the movable armature 5 It is guided in this disto the provision of the bearing balls 11. However, owing to the resilient connection provided by the washers ill, the displacement ofthe armature has a comparativelylarge amount of freedom and allows the pole pieces of the:

armature 5 to be applied against the poles of the core irrespective of reasonable tolerances in machining and assembly, without interfering with the axial displacement of the posts. It will be noted thatin the attracted position of the armature, the ends of guide posts remote from the armature project beyond the baseplate ll.

On the energizing voltage being cut off, the springs 12 act to restore the armature to its idle condition; this movement being aided by the springs on the stationary contacts as will later appear.

Each of the posts 7 is formed, in directions parallel to the plane of the casings 3, with one or more prismatic recesses 70 in each of which at least one transverse vane 13 is disposed, constituting a contact bridge, and a spring 14. Each contact bridge carries at its one end a contact element 15 adapted to cooperate with a related contact element 16 carried by a conductor 17 secured in the casings 3.

Figs. 4a, 4b and 4c illustrate a number of possible arrangements for the stationary and movable contact construction. In Fig. 4a, the post 7 carries two bridge members 13a adapted to cooperate with'two main conductors 17a which, on attraction of the armature, will complete predetermined circuits including the said conductors 17a.

in Fig. 4b, the post 7 comprises a bridge member 13a for one main pair of conductors l7 and two smaller bridge members 13b between which a'spring 14b is inter- ;posed, and cooperating with respective'pairs of stationary conductors 17b. In the deenergized condition of the switch device, only one of the bridges 13b completes one circuit for a pair of conductors 17b, while in the energized condition only the other bridge member com plates a circuit for the other pair of conductors 17b. In either position the contact pressure has the value imparted by the related spring 1412. This arrangement provides a set of break-and-make contacts for related control' circuits.

in Fig. 4c, the post '7 carries two sets of bridges 1312 which thus are able to control four break-and-rnake circuits.

Where required, there may be provided on each side or" the relay switch a casing according to any of the types shown in Figs. 4a, b and 0 so as to provide a desired contact combination as required by the particular circuit hooloup to be controlled.

1 hus, with both casings constructed as shown in Fig."

40, there is obtained an auxiliary switch comprising four break contacts and four make contacts. With respective casings shown in Figs. 4b and 40, a switch 18 obtained which will be adapted to cut 011 one polarity of the main circuit and having three auxiliary break contacts and three auxiliary make contacts. By using two casings of the kind shown in Figs. 4a and 4 respectively, two polarities of a single phase currentcan be controlled with two auxiliary break and make contacts.

I The same result can be obtained by the use of two casings as shown Fig. 41). if respective casings of thetype shown in Figs. 4a and lb used, a three-phase circuit can be controlled while still having available an auxiliary break contact and an auxiliary make contact. Lastly, when using two casings as in Fig. 4a, all four polarities or" a two-phase current may be controlled.

llQISQVCT, as will presently be shown, in each of above cases at least two additional break and maize tacts can still further be made available.

order to make it possible to cut or? high current intensities in the main circuits by means of the contact bridges said contacts are preferably arranged in the manner described in co-pending application of Andre A. H. Souchet, Serial No. 742,869, filed of even date herewith for Cut-Off Switch) As there described in detail, those contacts such as 15 and id (Fig. 4a) which are to cut off high current values are preferably rectangular in shape and surrounded on two their sides by an angularly-bent plate of netic material, and said contacts are further dissymmetrically positioned with respect to the conductors supporting them and have a bevelled edge on the side remote from the bent plate 18 and parallel to conductors 13a and 17a.

As shown in Figs. 3 and 4d, each casing 3 is in two parts including a body or bottom part 3 and a cover part 3 said parts being assembled with screws 19 engagedin holes 20. The casing parts 3 and 3 each are formed with lugs 45 engaged in slots in plate 1, so as to locate the casings 3 positively on said plate and to complete the assembly between the two parts of each casing. A single screw 22 engaged in plate 1 is thus sufiicient to retain each of the casings 3 in position against the plate 1.

In the bottom part 3 of each casing, the stationary conductors 17, 17a and 17b are simply fitted into slots formed in the part 3 Further, a lug 40 projecting from the part 3 cooperates with a side notch formed in the conductor (see Fig. 42). The part 3 is moreover formed with cavities 23 for receiving the ends of connector screws 44 (see Fig. 4b). Thus, with the cover part of the casing in position, the conductors are firmly blocked in place.

As previously indicated the bridge contacts 130: and 1312 are simply fitted into the cavities 7c and for this purpose are formed with restricted intermediate sections. Thus all of the contact elements are readily accessible and dismantlable, it being simply necessary to remove the screws 1% and the casing covers 3 In the illustrated construction the winding 4 is adapted for energization with alternating current and, in order to prevent vibration ofv the switch, short-circuit rings 24 are provided (see Fig. 2) around the outer legs of the core. Moreover, the middle leg about which the winding is mounted may include an air-gap incorporated in it, in the form ofa thin sheet of brass inserted in a cutformed in the middle branch of the core.

To permit quick replacement of the winding and also, if desired, matching the windings with the switch units in assembly,'in accordance with the voltages used, the winding 4 is preferably mounted on the middl lag of the core through the resilient means now to'be described.

As shown in Fig. 3 the middle branch of the core has two spring plates 25 secured thereto by means of rivets as and formed at their outer ends with bent-out flanges 25a. The winding, is supported on a pair of blocks 27 made of flexible, elastic material and is retainedin place after engagement of the winding about the middle leg of the core by means of the flanges 25a. .Moreover the ends of the winding are led out to respective U-shaped conductive members 28 which engage the sides of that end flange of the winding spool directed towards baseplate 1. When the winding is positioned in place the conductive members 28 engage strips 29 electrically connected to two of the stationary conductors 17b, i.e. to two of the control circuit conductors.

In 03 168 where additional contacts are required, the

switch ;device described may be expanded in the following i; rranner. A pair of extensions 3% (see Figs. 1

and 2) are adapted to be secured, as by welding or solder, to the sides of the cross-shaped plate 6 for cooperation with actuating studs 31 of two contact blocks 32 disposed symmetrically between the casings 3 at each end of said casings. The blocks are supported on shoulders 53 of the casings 3 and are secured to baseplate i by screws 34'.

In the illustrated construction (Fig. the actuating stud 31 of each block 32 is in the form of a square rod and is formed with a cavity, in which cavities the ends of the bridge contacts 35 are received, and the contacts 35 are separated by the spring 36. The bridge contacts cooperate with contacts carried on the current input strips 37. In this manner two auxiliary break and make contacts are obtained at each end of the switch assembly.

it will be noted that in Figs. 3 and 5 the left-hand casing 3 is of the type shown in Fig. 40, while the right hand casing 3 is of the type shown in Fig. 4b. The switch device shown, therefore, is of a three-pole type involving an auxiliary break-and-make contact with the optional addition of two further break-and-rnake contacts in blocks 32 as described.

In the switch shown in Figs. 6 to 9, as in the earlier construction described, a baseplate 1 has secured to it the pair of casings 3 containing the stationary contacts. The casings include a pair of projecting studs 5 integrally molded therewith at the ends of the under face of the casings, and adapted to engage slots 56 (see Fig. 9) in the baseplate 1. The casings are further secured to the baseplate by means or screws 22 inserted in lugs 52 integrally molded with the casings and said screws engaging the side faces of the parts- 3 of the casings. The casings can thus be mounted on the baseplate without requiring access to the under or rear face of the baseplate.

The outer parts 3 of the casings are also formed with studs 45 at their base which project into the slots 56 and are secured to the inner parts of the casings by transversely extending screws, not shown, such as the screws 19 of Fig. 4d.

The side faces of the inner casing parts 3 have integrally molded therewith the further studs 53 (see Fig. 8) adapted to be received in the ends of tubular spacer members 54 made of yielding, rubber-like material, hav ing an annular groove or restriction 54a formed in a midsection of said spacers. The opposite ends of the tubular spacers are engaged over the heads of screws 55 secured to the base of the side flanges 2a of the core 2. it will be understood that such screws may, if desired, be omitted and any equivalent means such as studs or lugs or other suitable securing means, e.g. welded-on-pins, punchedout lugs or the like, use-d instead.

Thus, as shown in Fig. 8, the core 2 is not in engagement with the baseplate 1 and is resiliently suspended by way of the spacer tubes 54 between the two casings 3. The suspension thus achieved has a high degree of flexibility owing to the provision or the grooves 54a.

To assemble. the core 2 in place, one of the casings 3 is first secured to the baseplate, then the core 2 is mounted, and the spacers are laterally fitted over the first casing. The second casing is then positioned by fitting its projecting studs 53 into the ends of the related tubular spacers 54 and fitting the studs 45 into the slots 56. Then the screw 22 is positioned. To facilitate the mounting operations described the spacers 54 may be more or less permanently secured to the studs 53 of the casings, e.g. by adhesive. At this stage in the mounting process, the winding 4 is freely put into position upon the middle leg of the core. The winding is provided with the flexible current input leads 57 which may be directly connected with the control circuit or may be secured to two of the screws 44 serving for connection with the stationary contacts in the casings. The winding is retained in position by the springs 58 interposed between the upper face of the winding and the bent flanges 5a of the armature S. The springs 58 are guided by being received in seating cups 59 on the upper face of Winding 4 and are engaged on studs 60 rigidly secured to the bent parts of flanges 5a.

The posts 7 are formed with reduced prismatic upper end portions 61 laterally formed with notches 61a. Fitted over the reduced end portions are rectangular collars 62 preferably made of wear-resistant material, e.g. superpolyannd, the side edge surfaces of which constitute slide stirfacesslidingly engaging the sides of the open top cavity 7 1 of the casings 3. The collars are further each formed with a central depression 62a. Engaging the collars and received in the depressions in them are the recessed ends 70 of each of the coplanar bent flange portions 5a. The flanges thus form a single fiat part bodily movable with the upper part of the armature and extending in crossed relation with it.

To connect this flat part with the posts there is provided a spring plate 63 pivoted about a pin 64 and having reuced ends 63a and 63b respectively, engageable with the notches 61a. The resilient strip 63 has a small rivet 65 adapted to engage a depression 66 in the upper face 7 of the fiat part mentioned above to lock the spring strip in position.

If desired, a thin plate 67 may be secured over the projecting flange portions So for concealing and protecting the armature 5, and may conveniently receive the usual printed data and specifications concerning the device.

As will appear from Fig. 7, the springs 58 act to apply the winding 4 against the base of the core at the lower ends of said springs, while the upper ends of the springs develop a restoring force applied to the posts 7 in a direction parallel with the posts. The upward displacement of the posts is limited by a shoulder 63 formed on the posts abutting a boss 69 on the casing part 3 The movable assembly including the armature and contact-carrying posts is guided in a direction parallel to the plane containing the legs of the armature, by engagement of the faces 62b of the collars 62 (see Fig. 9) with the corresponding sides of the cavity 71, and is guided in a direction normal to the armature by engagement of the ends of faces 62c with the flanged sides of cavity 71. Owing to the high wear-resistance and low friction characteristics of the collars 62 an extremely large number of switch operations can be effected without any appreciable wear in the guide surfaces. Moreover, because the guiding action is applied to the movable assembly in an area near the connection of the armature with the posts, the tendency of the movable assembly to be rocked or swung over is minimized. Since the tendency to rock is greater in the longitudinal than in the transverse di rection, the sliding surfaces 6211 are made larger than the effective sliding surfaces of the faces 620.

As will be apparent from Fig. 7, as a result of the flexibility of the strip 63, the connection of the posts with the armature possesses resiliency in a direction longitudinally of the posts. Moreover, owing to the freely interfitted relation between the apertures 70 and the reduced ends of the posts 7, and the reduced parts 63a and 63b of the strip 63, the movable armature is able to rock slightly about the axis defined by the points of engagement of the reduced ends 63a and 63b in the notches 61a. Consequently, on attraction of the armature, all three poles of the latter are able to engage closely with the related poles of the core. Moreover since the core is resiliently suspended between the casings, perfectly satisfactory engagement between the poles is achieved even should the polar surfaces assume an irregularly distorted condition after a great number of switch operations.

On closure of the switch device, the impact of armature 5 against core 2 is taken up by the tubular spacers 54 and hence is not transmitted to the stationary contacts through the baseplate 1. This also prevents rebound of the movable armature against the core and the consequent rebound of the movable contacts. Moreover, since the entire magnetic portion of the switch is suspended with respect to the stationary parts, such inevitable vibrations of the electromagnet as may remain in spite of the provision of the short-circuit rings 24, will not be transmitted to the stationary parts and the switch device will always operate smoothly and silently.

Various changes and modifications may of course be made in the constructional forms illustrated and described without departing from the scope of the invention as defined in the appended claims.

What I claim is:

l. A contactor switch comprising a base; a flat E-shaped core mounted on said base with the legs of the core extending from said base in a plane perpendicular to the plane of said base; an energizing winding on the middle leg of the core; a pair of hollow casing-like structures of insulating material secured to said base and projecting therefrom in parallel spaced relation at opposite sides of said core; a post in each of said casing-like structures and longitudinally slidable at right angles to the plane of said base, the longitudinal axes of the two posts defining a plane perpendicular to the lateral faces of said core and substantially coinciding with the transverse center line of said core, each of said posts having a portion projecting out of its associated casing-like structure; an E-shaped magnetic armature the legs of which are directed towards and alined with the legs of the core; a transverse rigid member secured to said armature; resilient connecting means between said transverse member and said projecting post portions; spring means for biasing said armature and posts away from said base in a perpendicular direction thereto; stop means for limiting the travel of said armature and posts in said direction; and movable contact means carried by said posts and cooperating stationary contact means within said casinglike structures, whereby energization of said winding attracts said armature and longitudinally displaces said posts to operate said contact means.

2. A contactor switch according to claim 1, wherein said projecting post portions are provided with lateral transverse recesses and said resilient connecting means includes an arcuate spring strip the ends of which are resiliently engaged within said recesses, an intermediate portion of said spring strip being in biasing engagement with the outer face of said transverse member. 7

3. A contactor switch according to claim 2, wherein an intermediate portion of said spring strip is pivotally connected to the outer face of said'transverse member, and means are provided for securing said strip in engaged position.

4. A contactor switch according to claim 1, further comprising an insulating spool-shaped member for said winding slidably mounted on the middle leg of said core, and wherein said post andarmature spring biasing means are coil springs located between said spool and said transverse member.

5. A contactor switch according to claim 1, further comprising rigid lugs extending from each end of said armature; a separate switch associated with each lug and having a casing and a push-button directed towards said lug for actuation thereby, each switch casing being mounted between the ends of said casing-like structures.

6. A contactor switch according to claim 1, wherein each casing-like structure comprises spaced walls disposed in planes substantially parallel to the longitudinal.

axes of the armature and the core; each wall being provided'with a lug cooperating in retaining engagement with recesses provided in the said base; one further laterally extending lug having an apertured face contacting said base; a securing screw engaged in said further apertured lug and in said base; and means for retaining the wall portions in assembled relationship.

7. A contactor switch according to claim 1, further comprising substantially frictionless guide means for the projecting post portions, said guide means being assembled within said casing-like structures.

8. A contactor switch according to claim 7, wherein each of said guide means includes a rectangular collar of wear-resistant material secured about its corresponding post and slidably engaging inner surfaces of said casing-like structures, the surface area of engagement being greater in a plane normal to the faces of said core and armature than in a plane parallel thereto.

9. A contactor switch comprising a base; a pair of hollow fiat casing-like structures of insulating material perpendicularly mounted on said base in spaced parallel relationship; an E-shaped flat magnetic core located between said structures in parallel relationship therewith, the legs of said core projecting from said base; resilient supporting means between the inner faces of said structures and the confronting faces of said core for yieldingly supporting the latter at a substantial distance from said base; a post perpendicular to the base and longitudinally slidable in each of said structures, the longitudinal axes of said posts defining a plane perpendicular to the lateral faces of said core and substantially coinciding with the transverse center line of said core; said posts having each a portion projecting out of its corresponding structure; an E-shaped magnetic armature the legs of which are directed towards the legs of the core; a transverse rigid member secured to said armature; resilient connecting means between said transverse member and said projecting post portions; spring biasing means for urging said armature and posts away from said base in a perpendicular direction thereto; stop means for limiting the travel of said armature and posts in said direction; and movable contact means carried by said posts and cooperating with stationary contact means within said structures.

10. A eontactor switch according to claim 9, wherein said resilient supporting means for the core comprise studs projecting from opposite sides of said core in aline' ment with cooperatingfstuds projecting from inner faces of said structures; and sleeves of resilient material inserted over each pair of alined cooperating studs.

Rosinget a1. Mar. 16, 1954 Meyer Dec. 3, 1957 

